CN113687093A - Low-rotation-speed detection system of aeroderivative gas turbine generator - Google Patents
Low-rotation-speed detection system of aeroderivative gas turbine generator Download PDFInfo
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- CN113687093A CN113687093A CN202110950951.5A CN202110950951A CN113687093A CN 113687093 A CN113687093 A CN 113687093A CN 202110950951 A CN202110950951 A CN 202110950951A CN 113687093 A CN113687093 A CN 113687093A
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- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 238000002955 isolation Methods 0.000 claims description 8
- 231100000136 action limit Toxicity 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
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- Control Of Eletrric Generators (AREA)
Abstract
The invention provides a low-rotation-speed detection system of an aeroderivative gas turbine generator, which comprises a zero-speed switch, a generator permanent magnet machine and a generator skid; the generator permanent magnet machine is arranged on a rotating shaft of the generator sledge, and the zero-speed switch is electrically connected with the generator permanent magnet machine. The present invention determines whether the generator shaft is completely stalled by monitoring the generator PMG (permanent magnet machine) rotational voltage/frequency.
Description
Technical Field
The invention relates to the technical field of gas turbines, in particular to a low-rotation-speed detection system of an aeroderivative gas turbine generator.
Background
When an aero-derivative gas turbine is shut down, its rotating shaft typically continues to run for several minutes, sometimes for a longer period of time until it is completely shut down. The control system must know exactly when the rotating shaft of the combustion engine stops rotating for subsequent lubrication protection. However, the low-voltage signal output by the existing rotating speed magnetic detector of the combustion engine at low rotating speed is lower than the control bandwidth of the existing control system, so that the low-speed signal cannot be obtained. It is necessary to add an additional low speed detection device to determine whether the rotating shaft has stalled.
Patent document No. CN110645097A discloses a gas turbine generator set rotor assembly and a gas turbine generator set, including: the gas turbine rotor comprises a centrifugal impeller and a centripetal turbine, and a floating drum-shaped spline coupler for only transmitting torque is arranged between the generator rotor and the gas turbine rotor; the gas turbine rotor also comprises a main shaft which is used for connecting the centrifugal impeller and the centripetal turbine and transmitting torque, and the centrifugal impeller, the main shaft and the centripetal turbine are coaxially and sequentially arranged; the supporting structure comprises a first supporting piece, a second supporting piece, a third supporting piece and a fourth supporting piece, wherein the first supporting piece and the second supporting piece are respectively arranged on a first journal and a second journal of the generator rotor, and the third supporting piece and the fourth supporting piece are arranged on the main shaft. However, the patent document still has the defect that the low-speed signal cannot be acquired.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a low-rotation-speed detection system of an aeroderivative gas turbine generator.
The invention provides a low-rotation-speed detection system of an aeroderivative gas turbine generator, which comprises a zero-speed switch, a generator permanent magnet machine and a generator skid;
the generator permanent magnet machine is arranged on a rotating shaft of the generator sledge, and the zero-speed switch is electrically connected with the generator permanent magnet machine.
Preferably, the zero-speed switch comprises a first terminal and a second terminal, and the first terminal and the second terminal are used for connecting an external auxiliary 24VDC direct current power supply.
Preferably, the device further comprises a third terminal, and the third terminal and the first terminal are used for connecting an external 125VDC direct current power supply.
Preferably, the zero-speed switch comprises a fourth terminal and a fifth terminal, and the fourth terminal and the fifth terminal are connected with the generator permanent magnet machine.
Preferably, the zero-speed switch includes a sixth terminal, a seventh terminal, and an eighth terminal, and the sixth terminal, the seventh terminal, and the eighth terminal are a pair of relay output contacts.
Preferably, a normally open contact is arranged between the sixth terminal and the seventh terminal.
Preferably, a normally closed contact is arranged between the sixth terminal and the eighth terminal.
Preferably, the technical parameters of the zero-speed switch are as follows:
inputting a signal: 0-320VAC RMS, and the capacity is 6VA under the highest voltage;
supplying power: 125V +/-20%, maximum current of 100mA or 24V +/-20%, and maximum current of 80 mA;
action limit value: the voltage limit is set to 1.5V RMS or the frequency limit is set to 2 Hz;
resetting and delaying: for 10S.
Preferably, the technical parameters of the zero-speed switch are as follows:
temperature range: operating at-20-65 deg.c and storing at 40-100 deg.c;
the output signal is that the capacity of the relay contact is 10A @250VAC or 2A @440 VAC;
isolation: the isolation voltage of the switch between the input end of the power supply and the input end of the signal is 1.5 kV;
a terminal: twelve crimp terminals.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention utilizes the zero-speed switch to solve the problem that the existing rotating speed sensor can not detect low rotating speed;
2. the invention can accurately judge whether the rotating shaft stops rotating or not so as to inform the main control system to enter the next control step, for example, the auxiliary lubricating oil pump is started to carry out low-speed turning, thereby realizing the protection of the rotating shaft of the gas turbine generator set;
3. the invention designs a special zero-speed switch, which monitors the rotation voltage/frequency of a PMG (permanent magnet generator) of the generator to determine whether the generator shaft completely stops rotating.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a system connection diagram of the present invention;
FIG. 2 is a graph showing the operation characteristics of the zero-speed switch according to the present invention;
fig. 3 is a connection circuit of the zero-speed switch of the present invention.
The figures show that:
zero-speed switch 1
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
Referring to fig. 1 to 3, the invention provides a low rotation speed detection system for an aeroderivative gas turbine generator, which comprises a zero-speed switch, a generator permanent magnet machine and a generator skid, wherein the generator permanent magnet machine is mounted on a rotating shaft of the generator skid, and the zero-speed switch is electrically connected with the generator permanent magnet machine. The zero-speed switch includes first and second terminals for connection to an external auxiliary 24VDC direct current power supply. And a third terminal, wherein the third terminal and the first terminal are used for connecting an external auxiliary 125VDC direct current power supply. The zero-speed switch comprises a fourth terminal and a fifth terminal, and the fourth terminal and the fifth terminal are connected with the permanent magnet machine of the generator. The zero-speed switch comprises a sixth terminal, a seventh terminal and an eighth terminal, the sixth terminal, the seventh terminal and the eighth terminal are a pair of relay output contacts, a normally open contact is arranged between the sixth terminal and the seventh terminal, and a normally closed contact is arranged between the sixth terminal and the eighth terminal.
The technical parameters of the zero-speed switch are as follows:
inputting a signal: 0-320VAC RMS, and the capacity is 6VA under the highest voltage;
supplying power: 125V +/-20%, maximum current of 100mA or 24V +/-20%, and maximum current of 80 mA;
action limit value: the voltage limit is set to 1.5V RMS or the frequency limit is set to 2 Hz;
resetting and delaying: for 10S.
The technical parameters of the zero-speed switch are as follows:
temperature range: operating at-20-65 deg.c and storing at 40-100 deg.c;
the output signal is that the capacity of the relay contact is 10A @250VAC or 2A @440VAC
Isolation: the isolation voltage of the switch between the input end of the power supply and the input end of the signal is 1.5 kV;
a terminal: twelve crimp terminals.
The preferred embodiment is as follows:
the low-speed detection system of the aeroderivative gas turbine generator comprises a zero-speed switch (A17), a generator Permanent Magnet Generator (PMG) and a generator skid.
A Permanent Magnet Generator (PMG) of the generator is arranged on a rotating shaft of the generator, and a zero-speed switch (A17) is connected through a circuit and receives an alternating-current voltage (frequency) signal output by the Permanent Magnet Generator (PMG).
Through a plurality of experiments and analyses, it can be determined that alternating voltage (frequency) signals output by a Permanent Magnet Generator (PMG) of the gas turbine generator can show a forward linear following variation trend along with the variation of the rotating speed of the rotating shaft of the gas turbine generator. According to the principle, an alternating voltage (frequency) limit value can be preset for a zero-speed switch (A17), the collected alternating voltage (frequency) of a Permanent Magnet Generator (PMG) is compared with the preset value, when the collected signal is lower than the preset limit value, a relay in the zero-speed switch is triggered to output, a normally open contact is closed, and a low-rotation-speed signal is sent out; and when the acquired signal value is higher than the preset value, the relay does not act, the normally open contact keeps a disconnected state, and no low-speed signal is sent out.
Fig. 2 shows an action characteristic curve of the zero-speed switch, as shown in the figure, the voltage limit is set to 1.5V RMS (1.5V average value), the frequency limit is set to 2Hz (hertz), when the alternating voltage (frequency) output by the permanent magnet machine is lower than the limit, the action region is located on the left side of the action curve, the action region is a switch action region (Relay-acted), and when the acquired signal value is greater than the limit, the action region is located on the right side of the action curve, the action region is a switch non-acted region (Relay de-acted).
The connection circuit of the zero-speed switch (A17) is shown in FIG. 3, an external auxiliary 24VDC (direct current) power supply can be connected between the terminals 2 and 1, an external auxiliary 125VDC (direct current) power supply can be connected between the terminals 3 and 1, and one of the voltage levels can be selected according to actual requirements; an alternating voltage (frequency) signal of a Permanent Magnet Generator (PMG) is connected between the terminals 5 and 4; a pair of relay output contacts are arranged between terminals 6,7 and 8, wherein a normally open contact is arranged between terminals 6 and 7, and a normally closed contact is arranged between terminals 6 and 8, and the normally open contacts 6 and 7 are selectively applied.
The recommended technical parameters of the zero-speed switch (A17) are as follows:
inputting a signal: 0-320VAC RMS (6 VA capacity at maximum voltage);
supplying power: 125V +/-20%, and maximum current of 100mA (milliampere);
or 24V +/-20%, maximum current 80mA (milliamp);
action limit value: voltage limit set to 1.5V RMS (1.5 volts average) or frequency limit set to 2Hz (hertz);
resetting and delaying: 10S (seconds);
temperature range: running at-20 ℃ to +65 ℃; storing at 40 ℃ to +100 ℃;
the output signal is that the capacity of the relay contact is 10A @250VAC or 2A @440 VAC;
isolation: the isolation voltage between the input end of the power supply and the input end of the signal can reach 1.5kV by the switch;
a terminal: 12 crimp terminals.
The present invention determines whether the generator shaft is completely stalled by monitoring the generator PMG (permanent magnet machine) rotational voltage/frequency.
Those skilled in the art will appreciate that, in addition to implementing the system and its various devices, modules, units provided by the present invention as pure computer readable program code, the system and its various devices, modules, units provided by the present invention can be fully implemented by logically programming method steps in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system and various devices, modules and units thereof provided by the invention can be regarded as a hardware component, and the devices, modules and units included in the system for realizing various functions can also be regarded as structures in the hardware component; means, modules, units for performing the various functions may also be regarded as structures within both software modules and hardware components for performing the method.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (9)
1. A low-rotation-speed detection system of an aeroderivative gas turbine generator is characterized by comprising a zero-speed switch, a generator permanent magnet machine and a generator skid;
the generator permanent magnet machine is arranged on a rotating shaft of the generator sledge, and the zero-speed switch is electrically connected with the generator permanent magnet machine.
2. The aero-derivative gas turbine generator low speed detection system of claim 1, wherein the zero speed switch comprises a first terminal and a second terminal, the first terminal and the second terminal for connection to an external auxiliary 24VDC dc power supply.
3. The aero-derivative gas turbine generator low speed detection system of claim 2, further comprising a third terminal, the third terminal and the first terminal for connection to an external auxiliary 125VDC dc power supply.
4. The aero-derivative gas turbine generator low speed detection system according to claim 1, wherein the zero speed switch comprises a fourth terminal and a fifth terminal, and the fourth terminal and the fifth terminal are connected with the generator permanent magnet machine.
5. The aero-derivative gas turbine generator low speed detection system according to claim 1, wherein the zero speed switch includes a sixth terminal, a seventh terminal, and an eighth terminal, and the sixth terminal, the seventh terminal, and the eighth terminal are a pair of relay output contacts.
6. The aero-derivative gas turbine generator low speed detection system according to claim 5, wherein a normally open contact is provided between the sixth terminal and the seventh terminal.
7. The aero-derivative gas turbine generator low speed detection system according to claim 5, wherein a normally closed contact is provided between the sixth terminal and the eighth terminal.
8. Aeroderivative gas turbine generator low speed detection system according to claim 1, wherein said technical parameters of said stall switch are as follows:
inputting a signal: 0-320VAC RMS, and the capacity is 6VA under the highest voltage;
supplying power: 125V +/-20%, maximum current of 100mA or 24V +/-20%, and maximum current of 80 mA;
action limit value: the voltage limit is set to 1.5V RMS or the frequency limit is set to 2 Hz;
resetting and delaying: for 10S.
9. Aeroderivative gas turbine generator low speed detection system according to claim 8, wherein said technical parameters of said stall switch are as follows:
temperature range: operating at-20-65 deg.c and storing at 40-100 deg.c;
the output signal is that the capacity of the relay contact is 10A @250VAC or 2A @440 VAC;
isolation: the isolation voltage of the switch between the input end of the power supply and the input end of the signal is 1.5 kV;
a terminal: twelve crimp terminals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110950951.5A CN113687093A (en) | 2021-08-18 | 2021-08-18 | Low-rotation-speed detection system of aeroderivative gas turbine generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110950951.5A CN113687093A (en) | 2021-08-18 | 2021-08-18 | Low-rotation-speed detection system of aeroderivative gas turbine generator |
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| CN202110950951.5A Pending CN113687093A (en) | 2021-08-18 | 2021-08-18 | Low-rotation-speed detection system of aeroderivative gas turbine generator |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3226514A (en) * | 1963-09-23 | 1965-12-28 | Leblond Mach Tool Co R K | Screw type zero speed mercury switch |
| US3597653A (en) * | 1970-04-17 | 1971-08-03 | Gen Electric | Digital low speed switch |
| CN104660138A (en) * | 2013-11-20 | 2015-05-27 | 广东美的制冷设备有限公司 | Zero-speed protective device and zero-speed detection method for permanent magnet synchronous motor |
| US20180248500A1 (en) * | 2017-02-24 | 2018-08-30 | General Electric Company | Integrated monitoring of an electric motor assembly |
| CN215339921U (en) * | 2021-08-18 | 2021-12-28 | 华电通用轻型燃机设备有限公司 | Low-rotation-speed detection device for aeroderivative gas turbine generator |
-
2021
- 2021-08-18 CN CN202110950951.5A patent/CN113687093A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3226514A (en) * | 1963-09-23 | 1965-12-28 | Leblond Mach Tool Co R K | Screw type zero speed mercury switch |
| US3597653A (en) * | 1970-04-17 | 1971-08-03 | Gen Electric | Digital low speed switch |
| CN104660138A (en) * | 2013-11-20 | 2015-05-27 | 广东美的制冷设备有限公司 | Zero-speed protective device and zero-speed detection method for permanent magnet synchronous motor |
| US20180248500A1 (en) * | 2017-02-24 | 2018-08-30 | General Electric Company | Integrated monitoring of an electric motor assembly |
| CN215339921U (en) * | 2021-08-18 | 2021-12-28 | 华电通用轻型燃机设备有限公司 | Low-rotation-speed detection device for aeroderivative gas turbine generator |
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